Jane,
Yes, this plant has leaves that are only 4 mm wide. Whatever it is,
it is also hardy--surviving sub 15F temps and snow last year. I don't
think Iris munzii would have lived through last winter in my yard.
Iain suggested replanting it, so I may divide it in half, and take a
very close look at the roots when I do so, to see what their
structure is like.
Thanks for your comments,
Kathleen
On Willapa Bay, Washington, as another sunny day ends.